/*-------------------------------------------------------------------------
 *
 * pidfile.h
 *      Declarations describing the data directory lock file (postmaster.pid)
 *
 * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/pidfile.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef UTILS_PIDFILE_H
#define UTILS_PIDFILE_H

/*
 * As of Postgres 10, the contents of the data-directory lock file are:
 *
 * line #
 *        1    postmaster PID (or negative of a standalone backend's PID)
 *        2    data directory path
 *        3    postmaster start timestamp (time_t representation)
 *        4    port number
 *        5    first Unix socket directory path (empty if none)
 *        6    first listen_address (IP address or "*"; empty if no TCP port)
 *        7    shared memory key (empty on Windows)
 *        8    postmaster status (see values below)
 *
 * Lines 6 and up are added via AddToDataDirLockFile() after initial file
 * creation; also, line 5 is initially empty and is changed after the first
 * Unix socket is opened.
 *
 * Socket lock file(s), if used, have the same contents as lines 1-5, with
 * line 5 being their own directory.
 */
#define LOCK_FILE_LINE_PID            1
#define LOCK_FILE_LINE_DATA_DIR        2
#define LOCK_FILE_LINE_START_TIME    3
#define LOCK_FILE_LINE_PORT            4
#define LOCK_FILE_LINE_SOCKET_DIR    5
#define LOCK_FILE_LINE_LISTEN_ADDR    6
#define LOCK_FILE_LINE_SHMEM_KEY    7
#define LOCK_FILE_LINE_PM_STATUS    8

/*
 * The PM_STATUS line may contain one of these values.  All these strings
 * must be the same length, per comments for AddToDataDirLockFile().
 * We pad with spaces as needed to make that true.
 */
#define PM_STATUS_STARTING        "starting"    /* still starting up */
#define PM_STATUS_STOPPING        "stopping"    /* in shutdown sequence */
#define PM_STATUS_READY            "ready   "    /* ready for connections */
#define PM_STATUS_STANDBY        "standby "    /* up, won't accept connections */

#endif                            /* UTILS_PIDFILE_H */
